Permanent ways



Patented Feb. 7, :1939 i V 4UNITED -isTATE-s v2,143,341 PEaMANENrwvAYs, Myrtil Kahn, lJologne-ltiehl,V Germany Application June 19, 1934, serial Nn. 731,235

l In Germany December 12, 1933 1 Claim. (Cl. 423S-283) This invention relates to improvements iir permanent ways.

In accordance with the present invention permanent ways are very much. improved as to noiselessness by coating parts of the same, particularly sleepers or intermediate pieces, with sqft rubber.

For a long time endeavours have been macle` towards smoothing orA damping the strong noise caused by rolling stock on metal rails. A great number of attempts lto attain the said aim in more or less complicated ways have been made without success, since the loads carried on rails are usually much higher. than those vcarried by automobiles, so that the methods applicable for the noiseless runningof the lattercan not be simply `transferred to rails and rolling stock. Practically all means suggested, such as layers of rubber on the rims of the railway wheels, or onthe surface of the rail, have failed since there. existed no possibility of durably attaching rubber to metal surfaces, particularly to steeL'without the assistance of mechanical means, which latter lead, however, to a comparatively quick deterioration of he rubber owing to therubbing of recesses or hol invthe rubber layers at said means. x

' In vmy copending application Serial Number 679,331,`1ed July '7, 1933, now Patent No. 2,057,- 955, dated October 20, 1936, I have shown a -metho'd of overcoming the said disadvantages by v`attaching soft rubber tothe bottom of the rails by means of isomerized rubber.

I have now found that the desired aim of avoid- 1 ing the noise of rolling stock on metal rails, such as of railway, street car and` underground traffic, can" be simply attained by firmly interposing at least one sheet of a soft rubber -materialpsuch as natural or synthetic rubber, gutta'percha or balata, or soft vulcanization products thereof, between rail and sleeper with the aid of an intermediate adhesive layer of strongly adhesive rubber, so that the intermediate layer is firmly a tached to one horizontal surface of .the supporting may. be obtained, for example. by isomerizing rubber 'with the aid of heat or chemical agents as described, for example, in the BritlshPatents Nos. 352,080 and 371',339,the French Patent No.. '109,814 and the U. S. Patents Nos. 1,732,886 and 1,744,880; or by the combination of rubber with `haemoglobin as described in the U. S. Patent No. 1,841,322,.or withcopper and cobalt salts as described in the British Patent No. 307,056.

Inthe following theinvention will bel described 10 i with greater particularity4 and with reference to the accompanying drawing, invwhich- Figures 1 to 4 inclusive are cross-.sectional views of rails supported upon intermediate pieces resting on sleeperswith noise-deadening layersinter- 15 posed between rails and sleepers; and

lFigure 5is a perspective view of the inter' mediate piece of Figures 2 to 4 inclusive showing a noise-deadening layer adhesively secured to the upper surface thereof.

Figure 1 shows a rail I, an intermediate piece 5,

- an intermediate layer of vulcanized rubber material 6 firmly fixed to the sleeper 4 by means of an adhesive layer o, for example, isomerized rubber 'l and the usual screws 2. A similar ar- 25 rangement is shown in Figure 2 in which, however, the intermediate piece is a so-called hookplate 5 the hook 3 of which; replaces one of the screws shown in Figure 1. In this case the inter-d mediate layer 6 is fixed to the top of the hook- 30 plate by means of the adhesive layer 1. This sameembodiment is illustrated in Figure 5 which shows the hook-'plate 5 with rubber layer 6 adhesively secured, by adhesive layer 1, to the upper surface of the' plate. Figure 3 shows a hook-plate 5 the 35 bottom of which is covered, with an intermediate layer of vulcanized rubbermaterial 6 by means of the adhesive layer l. Figure 4 shows a hookplate 5 the .top and bottom of which are both covered with an intermediate layer of'vulcanized 40 rubber material 6 by. means of the 'adhesive layer 1.

The covering of the supporting means with the soft vulcanizedrubber material may be carried out by coating. it with isomerized rubber and 45 pressing on a sheet of vulcanized rubber material while the coating is tacky and preferably while warming, or one surface of the said sheet may be isomerized and then pressed on the desired place.

The following examples will further illustrate 50 the invention: h Example 1 The rail-coveredvportions of iron or woodenv sleepers are freed from impurities and then coated with a solution in benzene or innemen rubber prepared by heating rubber for about six hours together with about 7 per cent by weight of phenol sulionic acid to about 140 C. After drying. a sheet of soft rubber is pressed on the nlm formed while heating for about one hour and a halt to about 125 C. Railsarethentastenedtothe sleepers as shown in Figure 1.

Example 2 Example 3 'I'he lower surface of a hook-plate is coated with a sheet oisoft rubber of about 2 cms. thickness with the aid of an intermediate layer prepared according to the methods described in the British lPatent 307.066.

Example 4 The upper and lower surfaces of bed-plates are coated with a sheet of soft rubber of about 2 cms. thicknessl with the aid of an intermediate layer prepared according to the method described in the U. S. Patent 1,841,332.

What I claim is: I

The combination with a railroad rail, a tie and a tie plate forsupporting said rail on said tie,vof two layers of resilient rubber material permanently attached respectively to the upper and to the lower surfaces of said tie plate by means of a strongly adherent adhesive material, said rubber material layers covering all of the surfaces of said plate which when in normal use would engage l5 either said rail or said tie, said rubber layers being otherwise free of attachment, whereby thetie plate and adherent rubber layers may be handled as a unit and said rail may have cushioned relative movement on said tie plate and said tie plate 2 be cushioned on said tie.

MYRTIL KAHN. 

